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472be4d139
Some multi-function input devices (e.g. combo keyboard and mouse) present as IAD-style devices (https://www.usb.org/defined-class-codes, https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-interface-association-descriptor). Historically, multi-function devices would report a DeviceClass of 0, indicating that interface matching should be done on the interface descriptor rather than the global device descriptor. IAD-style devices us DeviceClass of 0xEF, so they don't match MatchUsbClass() for keyboard (DeviceClass=3, SubClass=1, Proto=1). If they are treated as if they had a DeviceClass of zero, which is more traditional for legacy multi-function devices, then the interface descriptors are used instead and these types of devices will "just work" without needing to add a custom USB device path to ConIn. Signed-off-by: Aaron Pop <aaronpop@microsoft.com> |
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| Bus | ||
| Core | ||
| Include | ||
| Library | ||
| Logo | ||
| Test | ||
| Universal | ||
| MdeModulePkg.ci.yaml | ||
| MdeModulePkg.dec | ||
| MdeModulePkg.dsc | ||
| MdeModulePkg.uni | ||
| MdeModulePkgExtra.uni | ||